<!DOCTYPE html>
<html>
<head>
 <meta charset="UTF-8">
 <title></title>
 <script type="text/javascript">
	var a=100;
	var b=1;
	var c=b||a++;
	alert(c);
	alert(a);
 </script>
 </head>
 <body>

 </body>
 </html>